import {
    Select,
    SelectItem,
    Table,
    TableBody,
    TableCell,
    TableColumn,
    TableHeader,
    TableRow,
} from '@heroui/react';
import { useEffect, useState } from 'react';

interface ChunkerData {
    terms: {
        id: string;
        name: string;
        courses: {
            id: string;
            name: string;
            chunks: {
                id: string;
                name: string;
                tokens: number;
            }[];
            images: string[];
        }[];
    }[];
}

export default function ChunkerDataTable({
    chunkerData,
}: {
    chunkerData: ChunkerData;
    }) {
    if (!chunkerData || !chunkerData.terms || chunkerData.terms.length === 0) {
        return (
            <div className="p-6 rounded shadow-md">
                <p className="text-lg text-default-500">No data</p>
            </div>
        );
    }
    // Initialize selected term to the first term in the program
    const [selectedTerm, setSelectedTerm] = useState<ChunkedTerm | null>(
        chunkerData.terms[0] || null
    );

    const [selectedCourse, setSelectedCourse] =
        useState<ChunkedCourse | null>(null); // Initialize to null

    const [flattenedChunks, setFlattenedChunks] = useState<FlattenedChunk[]>(
        []
    );

    const getFlattenedChunks = (course: ChunkedCourse | null) => {
        return course?.chunks.map((chunk) => ({
            id: chunk.id,
            name: chunk.name,
            tokens: chunk.tokens,
        }));
    };

    useEffect(() => {
        if (selectedTerm) {
            setSelectedCourse(selectedTerm.courses[0] || null);
        }
    }, [selectedTerm]);

    useEffect(() => {
        if (selectedTerm && selectedCourse) {
            setFlattenedChunks(getFlattenedChunks(selectedCourse));
        }
    }, [selectedCourse]);

    return (
        <div className="p-6 rounded shadow-md">
            {/* Term Selector */}
            <div className="flex flex-row gap-4">
                <Select
                    className="mt-1 block w-full rounded-md shadow-sm focus:ring focus:ring-primary text-lg"
                    selectedKeys={selectedTerm ? [selectedTerm.id] : []}
                    label="Select Term"
                    labelPlacement="outside"
                    onSelectionChange={(keys) => {
                        const key = Array.from(keys)[0];
                        setSelectedTerm(
                            typeof key === 'string' ? key : String(key)
                        );
                    }}
                >
                    {chunkerData.terms.map((term) => (
                        <SelectItem key={term.id} className="text-lg">
                            {term.name}
                        </SelectItem>
                    ))}
                </Select>

                {/* Course Selector */}
                <Select
                    className="mt-1 block w-full rounded-md shadow-sm focus:ring focus:ring-primary text-lg"
                    selectedKeys={selectedCourse ? [selectedCourse.id] : []}
                    label="Select Course"
                    labelPlacement="outside"
                    onSelectionChange={(keys) => {
                        const key = Array.from(keys)[0];
                        const courseId =
                            typeof key === 'string' ? key : String(key);
                        const courseToSet =
                            selectedTerm?.courses.find(
                                (c) => c.id === courseId
                            ) || null;
                        setSelectedCourse(courseToSet);
                    }}
                >
                    {(selectedTerm?.courses || []).map((course) => (
                        <SelectItem key={course.id} className="text-lg">
                            {course.name}
                        </SelectItem>
                    ))}
                </Select>
            </div>



            {/* Courses Table */}
            {selectedTerm && selectedCourse && flattenedChunks && (
                <div className="my-12 overflow-hidden rounded-xl">
                    <div className="overflow-auto max-h-[60dvh]">
                        <Table className="min-w-full">
                            <TableHeader className="bg-default-50 sticky top-0 z-10">
                                <TableColumn className="px-6 py-3 text-left text-xs font-medium text-default-500 uppercase">
                                    Name
                                </TableColumn>
                                <TableColumn className="px-6 py-3 text-left text-xs font-medium text-default-500 uppercase">
                                    Tokens
                                </TableColumn>
                            </TableHeader>
                            <TableBody className="bg-default divide-y divide-default-200 max-w-full">
                                {flattenedChunks.map((chunk, i) => {
                                    return (
                                        <TableRow
                                            key={i}
                                            className={`border-default-200`}
                                        >
                                            <TableCell
                                                    className={`px-6 whitespace-nowrap truncate max-w-xs text-lg font-semibold`}
                                            >
                                                {chunk.name}
                                            </TableCell>
                                            <TableCell
                                                className={`px-6 whitespace-nowrap truncate max-w-xs`}
                                            >
                                                {chunk.tokens}
                                            </TableCell>
                                        </TableRow>
                                    );
                                })}
                            </TableBody>
                        </Table>
                    </div>
                </div>
            )}
        </div>
    );
}